Method for clearing, decoloring and decontaminating sugar juice

Abstract

The invention relates to a method for clearing, decoloring and decontaminating sugar juice. The method comprises the following steps: heating the sugar juice to 25-35 DEG C; pre-liming until the pH value is 6.5-7.5; after preliming, heating the sugar juice to 55-75 DEG C; adding calcium hydroxide emulsion and a citric acid solution, stirring, and reacting for 15-35 minutes at the constant temperature of 55-75 DEG C, wherein the adding amount of calcium hydroxide is 0.10%-0,60% of weight of sugar juice, and the adding amount of citric acid is 0.10%-0.50% of weight of sugar juice; and further heating to 75-100 DEG C, adding 0.5-10ppm of flocculation auxiliary polyacrylamide, standing at the constant temperature, flocculating and precipitating so as to obtain the clear sugar juice. In the method, citric acid reacts with calcium hydroxide so as to obtain a regenerated calcium citrate precipitate particle which is used for decoloring, decontaminating and clearing the sugar juice; the clearing process is simple, is easy to control and is environmentally-friendly; and the method provided by the invention has the advantages of good clearing, decoloring and decontaminating effects, low cost, available raw materials and less filter mud.

Description

technical field [0001] The invention relates to a method for clarifying, decolorizing and removing impurities of sugar juice. Background technique [0002] The clarification, decolorization and impurity removal of sugarcane mixed juice is the key process of sugarcane sugar production. At present, sugar cane sugar production generally adopts the sulfurous acid sugar production process or the carbonation sugar production process. The sulphite sugar production process is to generate sulfur dioxide gas through sulfur combustion, and the sulfur dioxide gas is passed into the pre-ashed cane juice (or sugar juice) for reaction, and the new calcium sulfite precipitate is obtained, and the new calcium sulfite precipitate particles are absorbed in the sugar juice Pigment and other impurities, and then add flocculant for flocculation and sedimentation to realize decolorization, impurity removal and clarification of sugar juice. This method uses harmful sulfur dioxide gas, causes seri...

AI Technical Summary

Problems solved by technology

[0005] Regarding the decolorization technology of sugar juice, sugar workers from all over the world have carried out a lot of research, and successively proposed ion exchange technology, membrane separation technology, ultra-freezing crystallization technology, biological enzyme method, inorganic-organic composite clarifier and its clarification process and other methods, but the cost is high and the technology is strong, and it has not been widely used in production in my country.